ESRM 350 The Decline (and Fall?) of the White-tailed Jackrabbit
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1 ESRM 350 The Decline (and Fall?) of the White-tailed Jackrabbit Autumn 2013
2 Outline (the 5 Components) (1) Background why leporids are such great study subjects (2) About white-tailed jackrabbits (3) The conservation problem: where have all the jackrabbits gone? (4) The science what we know, and need to know (5) Solution(s)?
3 1. Background All the world will be your enemy And when they catch you, they will kill you But first they must catch you - Richard Adams, Watership Down
4 15 years of Leporid Research Long-term study: predation as a driver of dynamics in low-density snowshoe hare populations Work began in Idaho (1998); now in northern Okanogan County, WA Why snowshoe hares? The ultimate prey species Lolo Pass, ID
5 Hares and Rabbits
6 Hares and Rabbits Hares Rabbits Tend to be larger Don t live in burrows Produce precocial young ( leverets ) Tend to be smaller Live in burrows Produce altricial young ( kits )
7 Where Do Jackrabbits Fit? Hares Rabbits Tend to be larger Don t live in burrows Produce precocial young ( leverets ) Tend to be smaller Live in burrows Produce altricial young ( kits )
8 Where Do Jackrabbits Fit? Hares Rabbits Tend to be larger Don t live in burrows Produce precocial young ( leverets ) Tend to be smaller Live in burrows Produce altricial young ( kits )
9 2. The White-Tailed Jackrabbit Lepus townsendii 3-5 kg (6-10 lbs) Generally associated with open prairie (short grasslands) Populations in cold areas molt into a white winter coat* do not hibernate *Hansen and Bear (1963) J Mammalogy Herbivorous forbs and grasses in summer; woody browse in winter (e.g., sagebrush) Hindgut fermenter Microbial fermentation in the large intestine and cecum Coprophagic Fecund 2-4 litters/y; 3-6 leverets per litter
10 Many Enemies Important food source for many grassland predators notably: coyotes, foxes, and birds of prey (e.g., golden eagle to the right) Aquila chrysaetos Canis latrans Vulpes vulpes
11 Good Defenses Hiding (in forms) Keen senses (big eyes, ears) Speed (up to 50 mph) Leaping (up to 20 feet) Agility Nocturnal Rogowitz (1997) J Mammalogy
12 3. The Conservation Problem Across the American west, jackrabbits appear to be in sharp decline - Interesting because whitetailed jackrabbits listed as least concern by IUCN The challenge - we don t know why y-axis metric accounts for hunter effort Ripple et al. (2013) Biological Conservation
13 Jackrabbits Gone From Yellowstone? In the Gardiner Valley, WY jackrabbits once a common sight but now rare Berger (2008) Oryx
14 International Union for the Conservation of Nature (IUCN) Lists the white-tailed jackrabbit as Least Concern - population trend listed as decreasing, however Why?
15 International Union for the Conservation of Nature (IUCN) Lists the white-tailed jackrabbit as Least Concern - population trend listed as decreasing, however Why? The shifting baseline syndrome * *Pauly (1995) TREE
16 4. What Does Science Say About Possible Culprits?
17 Possible Culprits: Agriculture? White-tailed jackrabbits thrive in open, short- to midheight grasslands - short vegetation facilitates visibility; impedes escape (sprinting) - short grasslands maintained by grazing, disturbance Iowa Department of Natural Resources (2004)
18 Possible Culprits: Agriculture? White-tailed jackrabbits thrive in open, short- to midheight grasslands - short vegetation facilitates visibility; impedes escape (sprinting) - short grasslands maintained by grazing, disturbance Much of the species range is cultivated - tall crops (corn) reduce habitat quality - Recent popularity of corn has exacerbated problem Iowa Department of Natural Resources (2004)
19 Possible Culprits: Livestock Ripple et al. (2013) Biological Conservation
20 Possible Culprits: Coyote Irruption Once a prairie species - coyotes are now ubiquitous in North America - historical accounts suggest rarity throughout the west* - roughly 1 million in the western 11 states alone* *Ripple et al. (2013) Biological Conservation
21 Possible Culprits: Coyote Irruption With short grasslands diminishing - Could white-tailed jackrabbit also be succumbing to increasing predation pressure? *Ripple et al. (2013) Biological Conservation
22 5. Research Needs and Possible Solutions The landscape of the American west has changed dramatically Hypothesis one: white-tailed jackrabbits are in decline because of loss and fragmentation of short-grass prairie - What do we need to test it? - If supported, what might some policy options be?
23 5. Research Needs and Possible Solutions The landscape of the American west has changed dramatically Hypothesis two: white-tailed jackrabbits are in decline because of competition with livestock - What do we need to test it? - If supported, what might some policy options be?
24 5. Research Needs and Possible Solutions The landscape of the American west has changed dramatically Hypothesis two: white-tailed jackrabbits are in decline because of competition with livestock - What do we need to test it? - If supported, what might some policy options be? - Could grazing be compatible with jackrabbits?* *Flinders and Hansen (1975) J Range Management
25 5. Research Needs and Possible Solutions The landscape of the American west has changed dramatically Hypothesis three: white-tailed jackrabbits are in decline because of increasing predation by coyotes - What do we need to test it? - If supported, what might some policy options be?
26 Coda: Reason for Optimism? Aldo Leopold (1937) American Forests
27 Coda: Reason for Optimism? Wolves are on the rise in the west
28 Coda: Reason for Optimism? Coyotes affected (direct killing by wolves, avoidance, and?*) *Ripple et al. (2013) Biological Conservation
29 Coda: Reason for Optimism? Coyotes affected (direct killing by wolves, avoidance, and?*) *also, dietary shift
30 Coda: Reason for Optimism? Coyotes decline (reduced predation on jackrabbits in some areas) Jackrabbits rebound? In all areas?
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